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CVE-2026-89489 (GCVE-0-2026-89489)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 12:00
VLAI
Title
openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
Summary
In the Linux kernel, the following vulnerability has been resolved: openrisc: fix arbitrary kernel memory access via or1k_atomic syscall sys_or1k_atomic() (syscall 244 in the "or1k" ABI) takes two user pointers, v1 and v2, and swaps the words they point to in hand-written assembly. l.lwz r29,0(r4) l.lwz r27,0(r5) l.sw 0(r4),r27 l.sw 0(r5),r29 The pointers are not checked with access_ok(). The four memory accesses also have no exception table entries. A caller passes a kernel address as either pointer, and the syscall reads from and writes to it directly. This gives an unprivileged process a kernel read/write primitive. It overwrites kernel data such as the sys_call_table, gaining code execution in kernel context. Check both pointers before entering the critical section. Add fixups for the four memory accesses so faults on valid but unmapped user addresses return -EFAULT. [shorne@gmail.com: fix comment style]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a , < bf310718c6fa6adeee06d207a55489546d860e2c (git)
Affected: 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a , < 497cba0b02e5555d99fe9ee1dc478af743ab7f7a (git)
Affected: 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a , < 1f2e92e499d863f81df1732af59b4a3559969193 (git)
Affected: 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a , < 574ae2ac2b314aa33498cd2c28add106cbe644f2 (git)
Affected: 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a , < a520e8cac54fb403f3800125b606f55fcad42cb9 (git)
Affected: 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a , < d64a75369cd0f2ee79afcc9d9ca34a3890989379 (git)
Affected: 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a , < b53435c079c78f89f70a62dd5a322cca4e292b34 (git)
Affected: 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a , < 78004e9a87f240df03e2f73120d291763c32e0a7 (git)
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Linux Linux Affected: 3.1
Unaffected: 0 , < 3.1 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nopenrisc: fix arbitrary kernel memory access via or1k_atomic syscall\n\nsys_or1k_atomic() (syscall 244 in the \"or1k\" ABI) takes two user\npointers, v1 and v2, and swaps the words they point to in hand-written\nassembly.\n\n    l.lwz   r29,0(r4)\n    l.lwz   r27,0(r5)\n    l.sw    0(r4),r27\n    l.sw    0(r5),r29\n\nThe pointers are not checked with access_ok(). The four memory\naccesses also have no exception table entries.\n\nA caller passes a kernel address as either pointer, and the syscall\nreads from and writes to it directly.\n\nThis gives an unprivileged process a kernel read/write primitive. It\noverwrites kernel data such as the sys_call_table, gaining code\nexecution in kernel context.\n\nCheck both pointers before entering the critical section. Add fixups\nfor the four memory accesses so faults on valid but unmapped user\naddresses return -EFAULT.\n\n[shorne@gmail.com: fix comment style]"
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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            {
              "lang": "en",
              "value": "AV:L - sys_or1k_atomic (syscall 244) is reached only via a local OpenRISC syscall into _sys_call_handler and sys_call_table; there is no network, adjacent-wireless, or physical-device path to the unchecked loads/stores in arch/openrisc/kernel/entry.S.\nAC:L - The attacker fully controls both pointer arguments and the swap is deterministic with no race or KASLR (OpenRISC has none); a published unprivileged PoC on qemu-system-or1k overwrote sys_call_table[174] and obtained uid=0 on every run.\nPR:L - Any unprivileged local process can invoke syscall 244; the handler performs no capable()/ns_capable() check, authentication, or init-namespace root gate before dereferencing the caller-supplied pointers.\nUI:N - The attacking process issues or1k_atomic itself with crafted kernel addresses; no other user must mount a filesystem, open a device, or otherwise interact.\nS:U - This is a standard host-kernel privilege escalation (arbitrary kernel R/W and commit_creds via a hijacked syscall); it does not cross a VM guest/host, IOMMU, or other security-authority boundary.\nC:H - The syscall atomically swaps two 32-bit words at attacker-chosen addresses with no access_ok(), so pairing a kernel pointer with a userspace buffer yields an arbitrary kernel-memory read primitive of any mapped word.\nI:H - The same swap is an arbitrary kernel write; the fix commit documents overwriting sys_call_table to run commit_creds(init_cred) and gain root, i.e. control-flow hijacking and full integrity compromise.\nA:H - Writes to unmapped or critical kernel addresses oops or panic because the original accesses had no exception-table fixups, and corrupting kernel text, data, or the syscall table can hang or crash the machine even without a full root exploit."
            }
          ]
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        "dateUpdated": "2026-09-14T12:00:24.593Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/bf310718c6fa6adeee06d207a55489546d860e2c"
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          "url": "https://git.kernel.org/stable/c/497cba0b02e5555d99fe9ee1dc478af743ab7f7a"
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    "datePublished": "2026-09-11T19:43:42.164Z",
    "dateReserved": "2026-09-11T19:38:34.713Z",
    "dateUpdated": "2026-09-14T12:00:24.593Z",
    "state": "PUBLISHED"
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It\\noverwrites kernel data such as the sys_call_table, gaining code\\nexecution in kernel context.\\n\\nCheck both pointers before entering the critical section. Add fixups\\nfor the four memory accesses so faults on valid but unmapped user\\naddresses return -EFAULT.\\n\\n[shorne@gmail.com: fix comment style]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/openrisc/kernel/entry.S\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\"lessThan\":\"bf310718c6fa6adeee06d207a55489546d860e2c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\"lessThan\":\"497cba0b02e5555d99fe9ee1dc478af743ab7f7a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\"lessThan\":\"1f2e92e499d863f81df1732af59b4a3559969193\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\"lessThan\":\"574ae2ac2b314aa33498cd2c28add106cbe644f2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\"lessThan\":\"a520e8cac54fb403f3800125b606f55fcad42cb9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\"lessThan\":\"d64a75369cd0f2ee79afcc9d9ca34a3890989379\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\"lessThan\":\"b53435c079c78f89f70a62dd5a322cca4e292b34\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a\",\"lessThan\":\"78004e9a87f240df03e2f73120d291763c32e0a7\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/openrisc/kernel/entry.S\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1f2e92e499d863f81df1732af59b4a3559969193\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/497cba0b02e5555d99fe9ee1dc478af743ab7f7a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/574ae2ac2b314aa33498cd2c28add106cbe644f2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78004e9a87f240df03e2f73120d291763c32e0a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a520e8cac54fb403f3800125b606f55fcad42cb9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b53435c079c78f89f70a62dd5a322cca4e292b34\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf310718c6fa6adeee06d207a55489546d860e2c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d64a75369cd0f2ee79afcc9d9ca34a3890989379\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-13T06:49:29+00:00",
      "cve": "CVE-2026-89489",
      "id": "CVE-2026-89489",
      "initial_release_date": "2026-09-11T19:43:42.164000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Arbitrary code execution via or1k_atomic syscall",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89489.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-16T00:03:00Z",
      "cve": "CVE-2026-89489",
      "id": "CVE-2026-89489",
      "initial_release_date": "2026-09-16T00:03:00Z",
      "product_status:known_affected": "349",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89489",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89489.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.